May 27, 2009 - Taesung Lee, Jihan Lim, Ildoo Chung, Il Kim, and Chang-Sik Ha*. Department of Polymer Science and Engineering, Pusan National University, ...
Preparation and Characterization of Polyimide/Modified β-Cyclodextrin Nanocomposite Films Taesung Lee, Jihan Lim, Ildoo Chung, Il Kim, and Chang-Sik Ha* Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea Received May 27, 2009; Revised July 2, 2009; Accepted July 15, 2009 Abstract: A series of pyromellitic dianhydrides (PMDAs)- 4,4'-oxydianiline (ODA) polyimide nanocomposite films with modified β-cyclodextrin (CD) were prepared via in situ polymerization and subsequent thermal imidization. The effect of CD modified with the functional group of -NH2 on the mechanical properties and dielectric constant of the nanocomposite films were investigated. The tensile strength and modulus of the nanocomposite films containing modified CD were higher than the neat PI. The dielectric constant decreased with increasing content of the modified CD up to 10 wt% from 3.34 for neat PI to 2.56. Keywords: modified cyclodextrin, dielectric properties, nanocomposite, polyimide.
Introduction
current associated with the metal ions in clay is another issue of concern. Additionally, there have been a few approaches to PI/mesoporous silica nanocomposites recently. Based on the low-dielectric constant of the mesoporous silica (k
